Fortress has redeveloped its
Pneumatic Valve+ (PV+) unit into a
modular design that allows the
configuration of an array of valves,
trapped key interlocks and key
switches in any combination.

The PV+ is suitable for the
isolation of a pneumatic power
source and is conventionally keyfree,
but the revised modular design
allows the unit to be used in
conjunction with other functional
modules, giving the user flexibility.

The PV+ has been designed to
complement the Fortress mGard
range of mechanical key interlocks
for heavy applications. Units work by
releasing and trapping keys in a predetermined
sequence to ensure safe
operation of dangerous machinery;
access is not permitted until a safe
condition has been achieved.

With the new PV+, a combination
of isolation/access keys is possible,
with sequential or non-sequential
key operation available. The PV+ has
a zinc alloy valve body and mild steel
zinc coated plates.